digbeta capturing audio channels

Hi

I am trying to capture from a digbeta master tape of a film which says on the box that there 4 audio channels. channels 1 & 2 is dialogue and channels 3 & 4 are music & effects. But when i capture it into final cut there are 4 audio channels but channels 1&2 also have the music & effects mixed into it with the dialogue and channels 3&4 it just the music & effects.

Is there away to separate out these tracks when capturing or in final cut as we don't have copy write for the music so we would like to be able to remove the music but keep the dialogue.

If it is important the capture settings are:

Device control: AJA Kona LH: PAL Sony VTR

Capture/input: AJA Kona LH 25 Apple prores

thanks from mike